Here's a tip:
Go into windows control panel and bring up the Game Controllers window. Open up and calibrate the stick you've got. Now after you're done calibrating you can test it (move it around and press the buttons).
Try to move the stick 1/2 up and 1/2 over and KEEP it there. Try 1/4 up and 1/4 over. Try mixtures of left/right up/down. If its jumping and really hard to steady, you've got a crap stick. If you can generally keep it in one spot, semi-steady without much input, your stick might be usable, and you may find another way of scaling the stick to suit your needs.
P.S. Also try making smooth motions and watch the crosshair in the test window. If you're moving from point A to B it should be smooth and steady. If it starts hopping around, or deviates up and down when it shouldn't, that falls under "crap stick" category.